Two No-Cost Garden Boosters From Kitchen Scraps

Diluting spoiled milk nine parts water to one part milk and pouring it over the soil near plants, especially tomatoes, helps fight disease — the milk's bacteria act as a natural fungicide.

Crushed eggshells, made mostly of calcium carbonate, sprinkled around young seedlings supply the calcium that helps form strong roots, stems, and leaves, giving vegetables a healthy head start.